SMUDGE, Colletotrichum circinans. P. S. R.: Red, yellow, and brown varieties, such as Southport Red Globe, Yellow Globe Danvers, and Australian Brown, are highly resistant. Inheritance: Resistance is perfectly correlated with dry scale color. Three pairs of genes are involved in the development of red, yellow, and white bulb color: C-c, a basic color factor, the dominant C gene being necessary for the development of any pigment, consequently all cc plants produce white bulbs; R-r, in the presence of C, the dominant R gene is responsible for the production of red pigment its allele r is responsible for yellow; 1- i, an inhibiting factor 1 is partially dominant over i; all 11 plants produce white bulbs.

SMUT, Urocystis cepulae. P. S. R.: Allium fistulosum. Inheritance: In species crosses between A. fistulosum and A. cepa the F, is intermediate in resistance but sterile. A fertile amphidiploid, Beltsville Bunching, has considerable resistance.

YELLOW DWARF, Marmor cepae. P. S. R.: Allium fistulosum. Nebuka and Beltsville Bunching are immune from all strains of yellow dwarf tested. Lines immune from the common strains of yellow dwarf are Burrell's Sweet Spanish, Colorado No. 6, Utah Sweet Spanish, White Sweet Spanish, Yellow Sweet Spanish, Crystal Grano, Early Grano, Early Yellow Babosa, White Babosa, Crystal Wax, Lord Howe Island, San Joaquin, and Yellow Bermuda. Inheritance: Undetermined.

PEA POWDERY MILDEW, Erysiphe polygoni. O. S. R.: Stratagem variety. P. S. R.: Stratagem variety. Inheritance: Resistance is monogenic recessive.

SEPTORIA BLOTCH, Septoria pisi. O. S. R.: One strain of Perfection and an introduction from Puerto Rico. P. S. R.: Perfection, if strain is still available. Inheritance: Not known.

WILT, Fusarium oxysporum f. pisi race 1. O. S. R.: Commercial varieties Alcross, Wisconsin Early Sweet, Wisconsin Perfection, and many others. P. S. R.: Wilt-resistant Alaska, wilt-resistant Early Perfection, wilt-resistant Perfection, and many others. Inheritance: Monogenic dominant.

NEAR WILT, Fusarium oxysporum f. pisi race 2. O. S. R.: Progeny in E. J. Delwiche nursery. P. S. R.: Delwiche Commando variety. Inheritance: Monogenic dominant.

YELLOW BEAN MOSAIC, bean virus 2. O. S. R.: Wisconsin Perfection. P. S. R.: Wisconsin Perfection. Inheritance: Unknown.

PEANUT LEAF SPOT, Cercospora arachidicola and C. personate. O. S. R.: No significant resistance in any cultivated variety examined. Arachis marginate nala and certain other wild species appear to be immune, but crosses with varieties of A. hypogaea have not been obtained. P. S. R.: None. Inheritance: Not known.

PEPPERS (Capsicum annuum)

BACTERIAL SPOT, Xanthomonas vesicatoria. O. S. R.: Commercial varieties Waltham Beauty, Oshkosh, Sunny-brook, Squash, Harris Early Giant (some strains only), Wonder (some strains only), Harris Earliest (some strains only), Cayenne (selections), Santaka (selections). P. S. R.: Those listed under O. S. R. Inheritance: Both monofactorial dominant resistance gene and multiple factors are suggested. There are no clear-cut data.

BACTERIAL WILT, Pseudomonas solanacearum. O. S. R.: Ornamental variety, grown locally on island of Oahu, Hawaii, is highly resistant but not immune. P. S. R.: Ornamental variety only. Inheritance: Undetermined.

ROOT ROT, Phytophthora capsici. O. S. R.: Oakview Wonder is reported resistant under field conditions. P. S. R.: Oakview Wonder. Inheritance: Unknown.

SOUTHERN BLIGHT, Sclerotium rolfsii.

O. S. R.: Capsicum frutescens var. Tabasco is highly resistant; C. annuum var. Santaka is moderately resistant.

P. S. R.: Varieties Tabasco and Santaka. Resistance is being incorporated into commercial varieties, primarily Bell and Pimiento types. Inheritance: Undetermined.

TOBACCO ETCH VIRUS, Marmot erodens. O. S. R.: Selections from Elephant Trunk x World Beater; Red Cherry, tolerant; P. E. I. 159241 highly resistant, possibly immune. P. S. R.: Varieties listed above, and resistance is being incorporated into commercial varieties, mainly Bell and Pimiento types. Inheritance: Undetermined.

WILT, Fusarium annuum. O. S. R.: A local variety in New Mexico and Mexican and Peruvian varieties. P. S. R.: Chili No. 9 and College No. 6 were developed by the New Mexico Agricultural Experiment Station, and the varieties Cristal, Nora de Murcia, and Cacho de Cabra Were developed in Peru. Inheritance: Undetermined.

ROOT KNOT, Meloidogyne spp. O. S. R.: Varieties Anaheim Chili, Italian Pickling, Santaka, Cayenne (selections). P. S. R.: Varieties under O. S. R. Inheritance: Unknown.

HAWAIIAN PEPPER VIRUS (identity unknown; distinct from tobacco mosaic). O. S. R.: Hawaiian variety Waialau highly resistant; Red Chili, Small Chili, and Tabasco are tolerant. P. S. R.: Varieties listed under O. S. R. Inheritance: Unknown; probably multiple factor.

PUERTO RICO MOSAIC VIRUS (identity uncertain; possibly related to potato mild mosaic, distinct from tobacco mosaic). O. S. R.: Native pepper of Puerto Rico and Cuaresmefio variety from Mexico. P. S. R.: California Wonder types. Inheritance: Resistance is monogenic.

TOBACCO MOSAIC, Marmot tabaci. O. S. R.: Capsicum annuum and varieties World Beater No. 13, Elephant Trunk, Hungarian Paprika, Fresno Chili, Capsicum frutescens, and Tabasco. P. S. R.: Commercial types of most varieties are being developed. Inheritance: Single dominant gene for necrotic flecking and leaf abscission.

POTATOES BLACKLEG, Erlcinza phytophthora. O. S. R.: Weak resistance in Europe exists in varieties Flava, Prisca, Robusta, and Starkeragis. P. S. R.: Original source and related seedlings. Inheritance: Unknown.

BROWN ROT Or SOUTHERN BACTERIAL WILT, Pseudomonas solanacearum. O. S. R.: Weak resistance exists in Katandin and Sebago. P. S. R.: Original sources. Inheritance: Unknown.

RING ROT, Corynebacterium sepedonicum. O. S. R.: President, Friso, Teton, and United States Department of Agriculture seedlings 46952 and 055, P. S. R.: President, Furore, Teton, Saranac, Seedling 46952, and a number of seedling varieties related to these. Inheritance: Unknown. Five resistant varieties selfed; 55.4 to 85.0 percent of seedlings resistant.

COMMON SCAB, Streptomyces scabies. O. S. R.: European varieties, Jubel, Arnica, Hindenburg, Rheingold, Ackersegen, and Ostragis. P. S. R.: Preceding varieties and American varieties, Ontario, Menominee, Seneca, Cayuga, Yampa, Cherokee, and related seedling varieties; also wild species Solanum commersonii, S. chacoense, S. caldasii var. glabrescens and S. jamesii. Inheritance: Tetrasomic. There is one gene difference in some crosses; apparently more than one in others. Degree Of resistance depends on dosage of resistance genes.

LATE BLIGHT, Phytophthora infestans.

O. S. R.: Solanum demissum immune from all known races. S. andreanum, S. ajuscoense, S. henryi, S. antipovichi, S. milani, S. poyadenium, S. vallis-mexici, S. verrucosum probably immune. W varieties from Germany, probably related to S. demissum, are resistant to field races. P. S. R.: Original sources. There is immunity from certain races in Essex, Ashworth, Placid, and seedling varieties related to Solanum demissum and Kennebec, Cherokee, and other named and numbered varieties descended from German W varieties. Inheritance: Tetrasomic polygenic, immunity dominant. Three, four, or more genes combined to produce immunity to all known races. Number of genes is determined by the reaction of different seedlings to different physiologic races of the organism; mode of inheritance of individual genes determined by ratios found in selfed lines.

VERTICILLIUM WILT, Verticillium alboatrum. O. S. R.: Menominee, Sequoia, Saranac, United States Department of Agriculture seedling varieties 41956, 792-88, X 528-170, B986-8, B595-76, and European varieties Libertas, Voran, Furore, Aquila, Friso, Iduna, and Populair. P. S. R.: Original sources and related seedling varieties. Inheritance: Unknown.

WART, Synchytrium endobioticum. O. S. R.: Snowdrop, Great Scott, Jubel, Hindenburg, and other European varieties, and the American varieties Green Mountain, Irish Cobbler, Triumph, Spaulding Rose, and Burbank. P. S. R.: In at least 80 European varieties and in Green Mountain, Irish Cobbler, Triumph, Spaulding Rose, Burbank, Katandin, Sequoia, Pawnee, Ontario, Kennebec, Calrose, Mohawk, Chisago, Mesaba, and a number of seedling varieties. Inheritance: Tetrasomic. One gene difference in some crosses and more than one in others. Dominant gene X giving immunity even in simplex. Genes Y and Z complementary conditioning immunity when both present even in simplex.

APHID INJURY. O. S. R.: Segregates of a cross between Houma and United States Department of Agriculture seedling variety 96-56. P. S. R: Same as original. Inheritance: Unknown.

HOPPERBURN. O. S. R.: Solanum polyadenium, S. macolae, S. commersonii, S. chacoense, S. caldasii, Rural, Sequoia, Hindenburg, Jubel, Katandin, and Sebago. P. S. R.: Original species and varieties and seedling selections related to the original varieties. Inheritance: Unknown.

LEAF ROLL. O. S. R.: Degree of resistance exists in Houma, Katandin, Triumf, Jubel, Flava, Imperia, Kepplestone Kidney, and Aquila. No varieties are immune. Immunity probably in Solanum chacoense and S. andigenum; tolerance in S. polyadenium. P. S. R.: Preceding varieties and species and in the United States Department of Agriculture seedlings X 927-3, X 1276-185, B 24-58, B 579-3, and other related seedlings. Some are more resistant than original varieties. Inheritance: Tetrasomic. Probably several genes. Katandin and Houma probably simplex for one gene; X 1276-185 probably duplex.

NET NECROSIS, current-season infection by leaf roll virus. O. S. R.: Immunity in Katandin, Chippewa, and several other varieties. P. S. R.: Preceding varieties and related seedling varieties. Inheritance: Unknown.

VIRUS A (A+X=mild mosaic) O. S. R.: United States Department of Agriculture seedling 24642, Irish Cobbler, and Spaulding Rose. P. S. R.: Seedling 24642, Irish Cobbler, Katahdin, Chippewa, Sebago, Kennebec, Earlaine, and many related seedling varieties. Irish Cobbler and Earlaine show hypersensitivity. Inheritance: Tetrasomic. Single dominant gene for field immunity. Katandin probably duplex.